Expansion-bolt.



D. R. BERRY.

EXPANSION BOLT.

APPLICATION FILED -]'ULY29,1907.

Patented Mar. 2, 1909.

A TTOHNEYS DAVID R. BERRY, 01 PORT RILHMOND, NEW YORK.

EXPANSION-BOLT.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed July 29, 1907. Serial 0. 385,960.

To all whom it may concern:

Be it known that I, DAVID R. BER-RY, a citizelrof the United States, and residing at Port Richmond, in the county 01" Richmond and of New York, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a specifih ch s in construction, and by I I I 1 a greater degree of expansion maybe secured is possible with devices of this classes usually constructed.

invention is-fully disclosed in the folspecification, of which the accomdraWingforms a part in which the separate parts of my improvement are desig Dated reference characters in each of the views, and in which Figure 1 is a side elevation of my improved expansion bolt; Fig. 2 a central longitudinal section thereof; Fig. 3 a side view of an expansion plug which I employ, and Fig. 4 a cross section on the line 44 of Fig. 2.

My invention belongs to the class of expansion 1plugs shown and described in U. S.

etters atent No. 7 19426 dated February 3, 1903, and 729124 dated May 26, 1903, and in the practice of my invention I provide a sleeve or tube a composed of two similar longitudinal parts a, and the tube or sleeve (1/, as a whole, is provided with annular grooves a in which are placed 0 en spring bands I).

The central bore of t is tube or sleeve a is beveled out or enlarged to form conically tapered walls a, and placed therein are tubular and conicall) tapered plugs c and (Z which a 2 preferably of the same' form and cons motion excc it that the central bore of the p rig c is threat ed as shown at 0 'lheexpansion plugs c and are provided on. their opposite sides with V-shapcd lugs c,

the base portions of which are directed outrecesses f ada ted to receive the lugseon the plugs c and when said plugs are inserted into said tube or sleeve a.

The base portions of the recesses f are provided with inwardly directed triangular projections f adapted to overlap the inwardly beveled corners e of the lugs e when the plugs c and d are inserted into the tube or sleeve a as shown in Fig. 1, and it will be understood that the s ring bands I) hold the separate parts a? of t e tube or sleeve a together, and also hold the plugs c and d therein, but the said plugs may be forced outwardly or drawn inwardly into the position shown in Fig. 1 whenever desired b means of a screw bolt g, the shank of whic is threaded to correspond with the thread in the plug1 c. v

When t e separate arts-a of the sleeve o are bound together y the 5 )rings 11 as shown in Fig. 1, the inwardly irected pro jections f are separated by a considerable space, said space, lnthe form of construction shown, being equal to the wider end ortions of the lugse, and this is an essentia feature of ap )licants construction by reason of the fact that without this construction'the plugs c and (1 cannot be inserted when the separate parts a of the sleeve 0. are bound together by the springs b as shown in Fig. lWllJllOlli) the exercise of great care and attention, and even with this the lugs 6 when the plugs c and d are inserted will force the Parts (1 of the sleeveo so far apart that the tension of the springs 11 will be destroyed and the suc: cessful assembling of the separate arts of the device therefore depends upon tiie space or spaces between the inwardly directed projections f at the ends of the separate parts a of the sleeve a.

The bolt g, in practice, is passed through 4 the plug d and sleeve a into the plug 0, andby turning said bolt to the right the plug 0 will be drawn inwardly and the correspondin portions of the separate parts a of the tu e or sleeve (1 will be forced outwardl in' the manner of other devices of this cass. By means of the inwardly beveled corners c of the lugs e and the inwardly directed projections f on the separate parts a of the sleeve (1, the plugs c and d may be heldin position in said sleeve when the separate parts thereof areheld together by the spring )and's b without the use of the bolt 9, and

said bolt may be inserted whenever desired and the plug 0 manipulated thereby as hereinbefore described, and by turning the bolt 1/ to the left the plug 0, or both of the plugs c and (I may be forced outwardly, in which operation the separate parts a of the tube or sleeve a will be forced apart.

In the use of an expansion belt of this class a board, plate or similar device may be placed between the head of the bolt 9 and the adjacent plug (Z, and said plug be forced into the divided sleeve a in the same manner as the plug c and to the same extent, and in this way the separate ends of the sleeve-will be forced apart exactly in the same manner and to the same extent, at both ends and a continuous hearing; will thus be formed in the aperture or hole in which the expansion bolt is placed, or the head of the bolt 9 may bear on the adjacent plug (Z and produce the same result. \Vith my impnwemcnt, however,. a much greater expansion of the sleeve 0 may be provided than with devices of this class as usually constructed for the reason that the farther in the said plugs are lrawn by turning the screw 9, the greater w ll be the expansion of the said sleeve a, and the plugs may be drawn into said tube or sleeve to any desired extent.

One of the chief features of my invention is found in the shape of the lugs c onthe plugs c and d, and in the shape of the recesses f in the opposite sides of the'opposite enilportions of the tube or sleeve (1. whereby the plugs c and (Z are locked in the opposite ends of the tube or sleeve (1 when said plugs are inserted into said ends.

My invention is not limited to the extent to which the bolt 9 is threaded nor to the exact form of the plug (1, and various changes -in and modifications of the cimsixruetion described may be made within the scope of the appended clann without departing lroin the spirit of my invention or sacrificing its advantages.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

A device of the class described comprising a tube or sleeve a divided longitudinally into two similar parts a and the central bore of which at the opposite ends thereof is beveled to form conieally inclined walls a, tubular conical plugs c and 01 adapted to be inserted into the opposite end portions of said tube or sleeve and provided at their opposite sides with V-shaped lugs e the base portions of which are directed outwardly, and the base gornersof which are beveled oil at e the separate parts of said tube or sleeve being also provided in their adjacent side faces and near their opposite ends with V-shaped recesses f of the same dimensions as said lugs and the base portions of which are directed outwardly and provided with inwardly directed projections f adapted to overlap the beveled corners e of said lugs, one of said plugs being also interiorly threaded, and a screw threaded bolt 9 passed loosely through the other plug and through said tube or sleeve and intothe screw threaded plug, said tube or sleeve being also provided with annular grooves a, and open spring bands I) placed therein, said projectionsf at the outer ends of the lugs 6 being separated when the parts a, of the tube or sleeve a are bound together.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 27th day of July 1907. p

DAVID R. BERRY.

Witnesses A. R. APPLEMAN, L. QUINN. 

